..."They are also Armenian in their view of salvation although they also try to use language to appeal to Calvinists."...
The"Lutheran critique & News article" is written by someone not at all Familiar w/ Promise Keepers, it is a ignorant view.
PK is an Evangelical Christian organization. PK would have Huge problems with the Mormon Church and Jehovah's Witnesses. Both are Cults, neither recognize Core Christian Doctrine. No one excludes members of either, all are welcome to Christ. It is THEIR "made up as you go" theology thats not welcome. As far as the Catholic Church goes, their are some issues that are not completely agreeable, BUT these issues are to be debated over, NOT to divide over.
Peace
There was significant dabate among conservative Presbyterians about 8 years ago as to whether PK was appropriate. Most finally determined that it ignored or glossed over important points and was not something that should be joined. One Presbytery even took action against a session over the issue.
http://www.presbyteriannews.org/volumes/v5/4/pulaski--complaints.html
A list of Reformed concerns about Promise Keepers can be found here:
http://www.prca.org/articles/article_6.html